Remove boost from motion_planning_rviz_plugin

[todoubaba]

Description

rviz_rendering::MovableText can only display non-mono font family currently, it is pointless to format the values with width (and the length of some label is greater than 10).

ss << boost::format("%-10s %-4.2f") % value.first % value.second << '\n';

so we can remove boost from dependencies.

Checklist

• Required by CI: Code is auto formatted using clang-format
• Extend the tutorials / documentation reference
• Document API changes relevant to the user in the MIGRATION.md notes
• Create tests, which fail without this PR reference
• Include a screenshot if changing a GUI
• While waiting for someone to review your request, please help review another open pull request to support the maintainers

[sjahr]

Thank you! Just a minor nitpick that is supposed to make the code easier to read

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02% ⚠️

Comparison is base (a2f0183) 50.71% compared to head (e773c84) 50.68%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2308      +/-   ##
==========================================
- Coverage   50.71%   50.68%   -0.02%     
==========================================
  Files         386      386              
  Lines       31914    31914              
==========================================
- Hits        16182    16173       -9     
- Misses      15732    15741       +9     

see 3 files with indirect coverage changes

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